USB 2.0 Disk Drives, Technical Challenges to Achieve Ease of Use | サイプレス セミコンダクタ
USB 2.0 Disk Drives, Technical Challenges to Achieve Ease of Use
Universal Serial Bus (USB) is an open interface standard that has been included on PC motherboards since late 1997. In 1998, the iMac was introduced, featuring only two i/o interfaces - USB and Ethernet. The first versions of the USB spec (1.0 and 1.1) supported maximum transfer rates of 1 Mbyte/s, with a raw bit rate of 12 Mbit/s. Windows 98 provided the first operating system support for USB with built-in drivers for a range of devices, including mice, keyboards and speakers. In April 2000, the USB Implementers Forum (USB-IF, comprised of Microsoft, Intel, Philips, HP, Compaq, NEC, and Lucent) released version 2.0 of the USB specification. This release added a new "high-speed" transfer rate of 480 Mbit/s, 40 times faster than the fastest rate offered in USB 1.1.